CN2214681Y

CN2214681Y - Level-controlled relay

Info

Publication number: CN2214681Y
Application number: CN 94237852
Authority: CN
Inventors: 黄光成
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-22
Filing date: 1994-07-22
Publication date: 1995-12-06
Anticipated expiration: 2004-07-22

Abstract

The utility model relates to a level-controlled relay, which is composed of a base (11), a frame (9), a transformer (10), a circuit board (8), and a housing (13). The utility model is characterized in that the frame is arranged on the base, the transformer is arranged in the frame, the circuit board is arranged on the frame, and a plurality of binding posts are arranged on the base; the circuit of the utility model is composed of a working power supply providing DC voltage, an LM324 integrated block, an LM555 integrated block, and a relay J, wherein, input signals are led into the 3 foot of the LM324 by a probe T, the output is led out by the 7 foot of the LM555 to the relay J, and the contact of the relay J is led out by the binding posts and is connected in the control circuit of the liquid-feeding pump positioned at the outer part. The utility model has the advantages of good stability, high reliability, and strong selectivity.

Description

Level-controlled relay

The utility model relates to relay, particularly a kind of level control relay that various liquid positions are automatically adjusted and control.

The product of liquid level control at present is more by " factory's electrical equipment handbook commonly used can be looked into, such as electrically contacting formula, ball float coupled switch formula, transistor discrete component amplify control etc., belong to 2 position prosecutor formula basically, and be more single to the conductance range of choice of various liquid.And conduct is rare to the product of the control of some special liquid levels, to the liquid level control product of the single-point control mode that adds slurry in the rotary screen printing machine cylinder automatically also seldom, the product that is used for this respect of domestic some manufacturer production is all not ideal enough at aspects such as reliability, stability, sensitivity selectivity in dyeing for example.

The purpose of this utility model is in order to solve the deficiency that the above-mentioned background technology exists, proposing a kind of level control relay that is suitable for single-point control exists, make that it is reliable more to liquid level control, safety, flexibly and selectivity good, to adapt to the request for utilization of wider various liquid medium conductances.

For achieving the above object, the utility model adopts following scheme, a kind of level control relay, be made up of base, framework, transformer and circuit board and shell, it is characterized in that: framework is positioned on the base, and transformer is contained in the framework, circuit board is positioned at above the framework, a plurality of binding posts are arranged on base, and circuit of the present utility model is by the working power that DC voltage is provided, LM324 integrated package, resistance R ₁, R ₂The in-phase amplifier of forming, LM324 integrated package, resistance R ₃, stabilivolt D ₁Comparison amplifier of forming and LM555 integrated package and relay J are formed, wherein, the anodal A of working power is connected on 4 pin of LM555 integrated package respectively, on 4 pin of 8 pin and LM324 integrated package, negative pole B is connected on respectively on 11 pin of 1 pin of LM555 and LM324, input signal is incorporated into input end 3 pin of in-phase amplifier by probe T through binding post, and input end 3 pin are through resistance R ₈Lead up to resistance R _AConnect the working power positive pole, another road links by diode 7D and probe T, and stabilivolt D1 is connected between 3 pin and working power negative pole of LM324, and 1 pin of LM324 and 5 pin of LM324 link, and 6 pin of LM324 are connected on resistance R ₃With stabilivolt D ₂Between, resistance R ₃With stabilivolt D ₂Be connected on after the series connection between the output terminals A, B of working power, 7 pin of LM324 and 6 pin of LM555 integrated package and 2 pin link, the indirect relay J of 7 pin of LM555 and positive source, the contact of relay J is drawn in the control loop that is connected on outside fluid filling pump by binding post.

2 pin of described LM324 integrated package can pass through resistance R ₁Link with the negative pole of working power, between 1 pin of LM324 and 2 pin, connecting an adjustable resistance R ₂

In such scheme, can connect an adjustable resistance R between 2,6 pin of 7 pin of described LM324 integrated package and LM555 integrated package ₇, between the negative pole of 2,6 pin of LM555 and working power, can connect a capacitor C ₄

The utility model adopts the integrated circuit block design, and detected liquid conduction operating resistance between from the probe to the zero potential is carried out computing, comparison, judgement, to determine whether to need to drive the small-sized high sensitive relay J of its inside, reaches the outside purpose of control.It is higher that the stability of level control relay, reliability are more generally formed relay with discrete elements such as transistors, and sensitivity, selectivity are stronger, can make its reliably working under 0～500K Ω operating resistance, this is that the general controller of detection mode of the same race that adopts is unapproachable.Be the direct current of several volts, microampere order between probe of the present utility model and the ground, the human body touch-safe is harmless.

Below in conjunction with embodiment shown in the drawings, specifically describe structure of the present utility model and principle of work.

Fig. 1 is stereoscopic figure of the present utility model.

Fig. 2 is the utility model inner structure schematic perspective view.

Fig. 3 is a circuit diagram of the present utility model.

Fig. 4 is the circuit diagram of working power.

See figures.1.and.2, binding post 1,2,3,4,5,6,7 of the present utility model lays respectively at the both sides of base 11, fixed orifice 12 is arranged in base 11, framework 9 is screwed on base, transformer 10 is fixed in the framework 9, circuit board 8 is housed on framework 9, and shell 13 covers on framework 9, transformer 10 and circuit board 8 outsides, and it adopts organic glass to make.

With reference to Fig. 3 and Fig. 4, circuit of the present utility model is made up of working power, LM324 integrated package, LM555 integrated package and relay J.Wherein, working power partly is made up of transformer 10, rectifying part and filtering, and the elementary winding of transformer 10 is connected on the power frequency 220V AC power by binding post 1,2, and time group winding output of transformer 10 is through diode 1D, 2D, 3D, 4D rectification, capacitor C ₁After filtering, three terminal integrated voltage stabilizer 7812 voltage stabilizings, output one galvanic current is pressed between output terminals A, B, each device work in this power voltage supply road.Be connected the capacitor C between output terminals A, B ₂Play the High frequency filter effect.

In circuit, 1,2,3 pin and resistance R of LM324 integrated package ₁, R ₂Reach other element and form a homophase amplifier, 3 pin of this amplifier are input end, and it passes through resistance R ₈, diode 7D links with probe T through binding post 4, the electric conductor shell of fluid to be measured container links through binding post 3 and working power negative pole.5,6,7 pin and resistance R of LM324 integrated package ₃, stabilivolt D ₂Form a voltage comparator, input end 5 pin of this comparer and 1 pin of pre-amplifier link.Connecting an adjustable resistance R between 2,6 pin of LM555 integrated package and output 7 pin of LM324 ₇, at this adjustable resistance R ₇Other in parallel diode 6D, 2,6 pin of LM555 also with a capacitor C ₄Link, 4, the 8 pin working power positive poles of LM555 link, and 1 pin and working power negative pole link, and 5 pin pass through capacitor C ₅Link with the operation source negative pole, 3 pin of LM555 pass through resistance R ₉, LED ₁Link with the working power negative pole, succeed electrical equipment J between 7 pin of LM555 and the working power positive pole, a diode 5D, LED at the other reverse parallel connection of relay J ₂With resistance R ₁₀Series connection back forward is connected in parallel on by the relay J, and the contact of relay J is drawn in the control loop that is connected on outside fluid filling pump by binding post 5,6,7.

1,2,3 pin and the R of LM324 ₁, R ₂And other elements are formed a homophase amplifier, 5,6,7 pin and R ₃, D ₂Form voltage comparator.After the energized, between probe and ground zero potential, (introduce) by power supply A point through R when being open loop state by connection terminal 4,3 _A, R ₈At D ₁The noble potential of last formation (changes R from the output of 1 pin after the 3 pin input of LM324 is amplified ₂Promptly change the enlargement factor of in-phase amplifier) deliver to 5 pin of LM324, the 6 pin current potentials of LM324 are D ₂On burning voltage, its make comparisons reference voltage of device, R ₃Be D ₂Current-limiting resistance.The voltage design at the 3 pin places of LM324 is when opening a way between probe and the ground zero potential, guarantees that all the 1 pin output potential of LM324 is higher than 6 pin place current potentials, makes the output of 7 pin high-order, through R ₇To C ₄Charging, make 2 pin of LM555,6 pin current potentials rise to 2/3rds operational voltage value when above, output 7 pin of LM555,3 pin all are 0 current potential.The relay J adhesive, the LED2 pilot lamp is bright, and the expression liquid level position is " low level ", and the normal battle of J is closed, and connects the control loop of outside fluid filling pump.

When liquid level rises operating resistance with the probe contact liq in 0～500K Ω scope, the 3 pin current potentials of LM324 descend, and make the output 1 pin current potential step-down of amplifier, and 7 pin of LM324 are 0 current potential when being lower than 6 pin current potentials of comparer, C ₄By diode 6D rapid discharge, 2 pin of LM555,6 pin place current potentials descend thereupon, and when voltage drops to 1/3rd operational voltage value when following, 7 pin, 3 pin of LM555 uprise current potential, and relay J discharges, LED ₂Extinguish LED ₁Pilot lamp is bright, and the expression liquid level position is " high position ", and disconnect the normal battle of J, and the control loop of disconnecting external fluid filling pump is adjusted R ₂Resistance, can make the various liquid operate as normal of operating resistance below 500K Ω, prevent misoperation.

Diode 7D can stop that extraneous unexpected noble potential scurries into capacitor C from probe ₆Be anti-interference pulse usefulness, stabilivolt D ₁The input voltage clamper of 3 pin that makes LM3243 on the voltage stabilizing value, protection LM324.

Delay circuit is by R ₇, C ₄Form, change R ₇Resistance, promptly changed the RC charging rate, contacted the back with probe, relay J has discharged, and after liquid level and probe disengagement, owing to R at liquid level ₇To C ₄Duration of charging, LM555 is overturn immediately, make relay time-delay adhesive, to adapt to the needs of real work.

Claims

1, a kind of level control relay, form by base, framework, transformer and circuit board and shell, it is characterized in that: framework is positioned on the base, transformer is contained in the framework, circuit board is positioned at above the framework, a plurality of binding posts are arranged on base, and circuit of the present utility model is by the working power that DC voltage is provided, LM324 integrated package, resistance R ₁, R ₂The in-phase amplifier of forming, LM324 integrated package, resistance R ₃, stabilivolt D ₁Comparison amplifier of forming and LM555 integrated package and relay J constitute, wherein, the anodal A of working power is connected on respectively on 4 pin of 4 pin, 8 pin and LM324 integrated package of LM555 integrated package, negative pole B is connected on respectively on 11 pin of 1 pin of LM555 and LM324, input signal is incorporated into input end 3 pin of in-phase amplifier by probe T through binding post, and input end 3 pin of in-phase amplifier are through resistance R ₈Lead up to resistance R _AConnect the working power positive pole, another road links by diode 7D and probe T, stabilivolt D ₁Be connected between 3 pin and working power negative pole of LM324,1 pin of LM324 and 5 pin of LM324 link, and 6 pin of LM324 are connected on resistance R ₃With stabilivolt D ₂Between, resistance R ₃With stabilivolt D ₂Be connected on after the series connection between the output terminals A, B of working power, 7 pin of LM324 and 6 pin of LM555 integrated package and 2 pin link, 7 pin of LM555 and the indirect relay J of positive source, and the contact of relay J is drawn in the control loop that is connected on outside fluid filling pump by binding post.

2, according to the described level control relay of claim 1, it is characterized in that: 2 pin of described LM324 integrated package pass through resistance R ₁Link with the negative pole of working power, between 1 pin of LM324 and 2 pin, connecting an adjustable resistance R ₂

3, according to claim 1 or 2 described level control relays, it is characterized in that: between 2,6 pin of 7 pin of LM324 integrated package and LM555 integrated package, connecting an adjustable resistance R ₇, between the negative pole of 2,6 pin of LM555 and working power, connecting a capacitor C ₄